20 Bridges Swim Field is limited to 25 solo swimmers and 18 relay teams that start and finish at Battery Park City. Fields sells out in less than 45 minutes. Race first held in 1927. Substantial surface chop and strong tidal pull are possible. Water temperature varies between 17 – 19°C (64 – 67°F). Course may also include random jetsam and flotsam. A Qualifying Swim must be completed before application will be accepted.